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Run HTTP + SSL + DNS + domain-expiry in one call and return a combined health snapshot. The single pre-flight check to run before crawling, deploying to, or depending on a site — cheaper and one round-trip instead of four.

Load the full page and measure time-to-first-byte, total load time, and downloaded size (capped at 5 MB). Use to gauge front-end performance before crawling, embedding, or depending on a page.

Resolve the site's IP and check it against 15 major DNSBL spam/abuse blacklists. Use before sending mail from, or trusting, a host. WARN = listed on 1–2 lists; DOWN = listed on 3 or more.

Look up the domain's registration expiry via WHOIS and report the expiry date and days remaining. Use to catch domains about to lapse before they drop and take DNS/email/site down with them.

Resolve a DNS record (A by default) for the host and return the values. Use to confirm a domain resolves and to detect missing or misconfigured records.

Inspect the site's TLS/SSL certificate: whether it is currently valid and how many days remain until it expires. Use to catch soon-to-expire or already-expired certificates before they break HTTPS for visitors.

Fetch a URL and report whether it is reachable, the HTTP status code, and the response time in milliseconds. A fast liveness/uptime probe — run it before relying on a site or as a cheap health signal.